Definition of outrigger

1 a: a projection with a float or a shaped log at the end attached to a boat to prevent capsizing

b: a spar or projecting beam run out from a ship's side to help secure the masts or from a mast to extend a rope or sail

2: a boat equipped with an outrigger

3: a projecting member run out from a main structure to provide additional stability or to support something;
especially: a projecting frame to support the elevator or tailplanes of an airplane or the rotor of a helicopter

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